Sporting cartridge-case

ABSTRACT

The invention relates to a sporting cartridge-case, comprising, in the known manner, a case, a metal base and a plug of plastic material having the general form of a cup whose free edge has, in the non-assembled state, a projection extending outside the external diameter of the body of said plug to form, after assembling by compression, a perfect gas-tightness of the cartridge, especially when shooting.

llnite Sttes [1 1 Veher atet [ Jan. 21, 1975 SPORTING CARTRIDGE-CASE Inventor: Lon Veber, 4, rue Georges Lardennois, Paris, France Filed: Feb. 10, 1971 Appl. No.: 114,370

Related US. Application Data Continuation of Ser. No. 733,483, May 31, 1968, abandoned.

[30] Foreign Application Priority Data June 5, 1967 France 67.109137 Oct. 31, 1967 France 67.126622 US. Cl 102/44, 29/131, 86/12 Int. Cl. F42b 9/26 Field of Search 102/38, 42, 42 C, 43 R,

[56] References Cited UNITED STATES PATENTS 1,541,438 6/1925 Schauerte 102/44 2,336,065 12/1943 Cadham 102/42 R 2,973,711 3/1961 Clark, Jr. r [02/44 X 3,246,603 4/1966 Comerford 102/42 Primary Examiner-Robert F. Stahl Attorney, Agent, or FirmEllsworth R. Roston 3 Claims, 6 Drawing Figures PATENTEU JANZ] I975 SHEET 2 BF 2 n n I I u I n I n I u I SPORTING CARTRIDGE-CASE This is a continuation of application Ser. No. 733,483 (now abandoned) filed on May 31, 1968, for SPORT- ING CARTRIDGE-CASE.

According to the invention, the sporting cartridgecase comprises a casing and a base assembled by a plug of plastic material, cartridge-case characterized in that the skirt of the plug has, in the rough state, a projection, so that when assembling the elements of the cartridge-case by compression, a part of said plug mass penetrates into the annular crimping rim of the metal base, whereas the other part of this mass goes in the opposite direction, by coming into close contact with the casing owing to the previous opening out provided in the vicinity of the free edge of the skirt of the plug of plastic material.

According to another characteristic of the invention, the metal base is fastened to the plug of plastic material introduced and positioned by deformation inside and at the bottom of the sporting cartridge-case, the fastening being effected by means of an extension of this base, said extension extending for the entire height of the priming chamber made in the center of the plastic plug, which enables a particularly strong assembling to be made between the base, casing and plastic plug.

Other characteristics and advantages of the invention will be revealed by the text of the description, claims and attached drawings, in which:

FIG. 1 is a section-elevation of an assembly plug between casing and base,

FIG. 2 is a section-elevation of the assembled elements of a cartridge-case,

FIG. 3 is a section-elevation showing a method of fastening the base-plug assembly,

FIG. 4 is a view showing an alternative execution of FIG. 3,

FIG. 5 is a view showing a section of another method of carrying out the cartridge-case,

FIG. 6 is a top view of FIG. 5. r

The sporting cartridge-case comprising, in a known manner, a base 1 and a base 2, assembled by a plastic plug or wad 5 comprising a skirt 6 at its top part.

According to a first characteristic of the invention, the skirt 6 of the plug or wad has a projection 7, opened out towards the exterior of the cartridge case for ensuring a close contact by pressure with the interior of casing of the cartridge-case and thus effects a total gastightness guaranteed by the skirt of the plastic plug or wad in the vicinity of the rear part of the cartridge-case, thus avoiding its deformation under the action of combustion gases, and hence guaranteeing the proper working of automatic or other arms at the moment of ejection.

For securing this result, this invention plans to make a skirt 6 having a projection 7 whose external diameter is greater than the internal diameter of the casing, 1.

As can be seen in FIG. 1, the plastic plug or wad 5 assembling the casing and the base of the cartridgecase has, in the rough state, a relatively thick bottom portion 20, a narrowed skirt 6 extending from the bottom portion 5, the skirt 6 being terminated by a projection 7 of triangular section whose point is directed towards the exterior of the cartridge-case. Thus, when assembling, one obtains a close contact of the plug by pressure of the skirt with the internal wall of the tube.

As a non-restrictive example, the largest diameter ex ternally corresponding to the point of the triangle formed by the projection 7 is greater by seven-tenths of a millimeter than the diameter of the wall of the cylinder. The height of this projection will, in this case, be 1,5 mm.

The invention also relates to a process for assembling between the base 2, the casing l and the plastic plug or wad 5, which consists, when mounting by compression of the plug or wad 5 inside the casing l, to compress the mass of said plug, so that part of this mass penetrates into the annular crimping rim 9 of the base 2, whereas the other part of this mass goes in the opposite direction, while remaining in close contact with the inner wall of the casing l owing to the previous opening out 7 provided in the vicinity of the free edge of the skirt 6 of the plug or wad 5, which enables perfect gastightness of the cartridge-case to be obtained when firing.

According to another characteristic of the invention, in the example of execution shown in FIGS. 3 to 6, assembling between base 2, casing I, plug 5 has been considerably consolidated by securely fastening the plastic plug 5 to the metal base 2.

To this end, the metal base 2 is provided with a central extension 2 extending over the entire height of the priming chamber 8 of the cartridge-case. The central extension 2 defines a central tubular priming chamber in the base. The base also defines an outer chamber 2 In the first method of execution shown (FIG. 3) the extension 2 of the base is terminated by a series of small tongues or teeth 2 of serrated shape which press into the thickness of the plastic material of the plug or wad 5 surrounding the priming chamber 8.

In the various methods of carrying out the invention, the small tongues 2 are provided of variable number, four or six, for instance, and are crimped into the plastic material of the plug.

In the execution example shown in FIG. 4, the teeth 2 of the extension of the base are slightly opened out externally, so as to penetrate into the mass of material forming the plug, which effects a very efficient fastenmg.

In the example of execution shown in FIGS. 5 and 6, the teeth 2 of the extension are totally or partially turned back on the top part of the plastic plug, and are so crimped that the teeth 2 penetrate into the mass of the plug.

This method of assembling enables an inseparable, rigid one-piece to be assembled, whatever the elastic or plastic deformations undergone by the various materials forming the cartridge-case, when firing.

It is not outside of the scope of the invention to povide for another method of fastening the priming chamber, such, for instance, as fillets made on the wall of said chamber in which the plastic material of the plug is impressed on the assembly, these fillets being able or not to be added to the fastening small tongues.

I claim: 1. A shotgun cartridge case including a substantially cup-shaped base having a tubular chamber and an extraction rim thereon,

a tubular casing having a greater height than said base and freely slidably insertable therein and fixedly attached thereto in pressure fit by a radially expanded end thereof within said extraction rim, and

means for securing and connecting said base and said casing to one another comprising a generally annular wad of thermoplastic material susceptible of permanent deformation, said wad located within said base and said casing, and extending to the bottom of said base comprising a uniformly cylindrical thick body portion,

a thinner central portion, said body portion and said central portion initially having a uniform diameter, and

an outwardly projecting end portion of expanded diameter and of substantially triangular cross section, said wad being compressed to be permanently radially outwardly deformed to radially expand said end of said tubular casing and said cup-shaped base to fix and maintain them together in said extraction rim in a pressure fit assembly and said outwardly projecting end portion of exanded diameter is inwardly radially deformed to form a gas-tight pressure fit with said casing.

2. A shotgun cartridge case including a substantially cup-shaped base having a tubular chamber and an extraction rim thereon,

a tubular casing having a greater height than said base and initially freely slidably insertable therein and ultimately fixedly attached thereto in pressure fit by a radially expanded end thereof within said extraction rim, and

means for securing and connecting said base and said casing to one another comprising a generally annular wad of thermoplastic material susceptible of permanent deformation, said wad located within said base and said casing and extending to the bottom of said base comprising a uniformly cylindrical thick body portion,

a thinner central portion, said body portion and said central portion initially having a uniform diameter, and

an outwardly projecting end portion of expanded diameter and of substantially triangular cross section, said body portion being compressed to be permanently radially outwardly deformed to radially expand said end of said tubular casing and said cup-shaped base into said extraction rim to fix and maintain them together in a pressure fit assembly and said end portion permanently radially inwardly deformed to form a gas-tight fitting with the inner wall of said tubular casing.

3. The cartridge case of claim 2 wherein said base includes a priming chamber having clamping means located near one end thereof and cooperating with said wad to further ensure the assembly of said base, said casing, and

said wad,

UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 3,861,309 Dated n ry 21, 1975 Inventor(s) Leon Veber It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

On the cover sheet insert:

[73] Assignee: Gevelot Societe Anonyme, Paris France Signed and Scaled this A ttes t:

RUTH C. MASON C. MARSHALL DANN Alresling ()fl'icer ('mmnissimu'r nj'larer'nx and Trademarks UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent Not 3,861,309 Dated n ry 21, 1975 Inventor) Leon Veber It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

On the cover sheet insert:

[73] Assignee: Gevelot Societe Anonyme, Paris France Signed and Stalcd this thirteenth Day of A t-11976 [SEAL] A ttes t:

RUTH C. M A sON C. MARSHALL DANN Amstmg ()jjtcer ('mnmissimwr uflalems and Trademarks 

1. A shotgun cartridge case including a substantially cup-shaped base having a tubular chamber and an extraction rim thereon, a tubular casing having a greater height than said base and freely slidably insertable therein and fixedly attached thereto in pressure fit by a radially expanded end thereof within said extraction rim, and means for securing and connecting said base and said casing to one another comprising a generally annular wad of thermoplastic material susceptible of permanent deformation, said wad located within said base and said casing, and extending to the bottom of said base comprising a uniformly cylindrical thick body portion, a thinner central portion, said body portion and said central portion initially having A uniform diameter, and an outwardly projecting end portion of expanded diameter and of substantially triangular cross section, said wad being compressed to be permanently radially outwardly deformed to radially expand said end of said tubular casing and said cupshaped base to fix and maintain them together in said extraction rim in a pressure fit assembly and said outwardly projecting end portion of exanded diameter is inwardly radially deformed to form a gas-tight pressure fit with said casing.
 2. A shotgun cartridge case including a substantially cup-shaped base having a tubular chamber and an extraction rim thereon, a tubular casing having a greater height than said base and initially freely slidably insertable therein and ultimately fixedly attached thereto in pressure fit by a radially expanded end thereof within said extraction rim, and means for securing and connecting said base and said casing to one another comprising a generally annular wad of thermoplastic material susceptible of permanent deformation, said wad located within said base and said casing and extending to the bottom of said base comprising a uniformly cylindrical thick body portion, a thinner central portion, said body portion and said central portion initially having a uniform diameter, and an outwardly projecting end portion of expanded diameter and of substantially triangular cross section, said body portion being compressed to be permanently radially outwardly deformed to radially expand said end of said tubular casing and said cup-shaped base into said extraction rim to fix and maintain them together in a pressure fit assembly and said end portion permanently radially inwardly deformed to form a gas-tight fitting with the inner wall of said tubular casing.
 3. The cartridge case of claim 2 wherein said base includes a priming chamber having clamping means located near one end thereof and cooperating with said wad to further ensure the assembly of said base, said casing, and said wad. 